I read a story some 45 years ago which featured the word "Irtnog." I know I read it at the same time I read "The Pedestrian." Is "Irtnog" from a Bradbury story? If so, which one. The theme of the story I remember is very like the passage in Farenheit 451 where Beatty discusses the devaluation of reading and the condensation of communication.

Nope, it's by E. B. White: http://www.raybradbury.com/ubb/Forum1/HTML/000734.html

Located Quo Vadimus by E. B. White (New York: Grosset & Dunlap, 1939). This book contains on pp. 44-49, the short story "Irtnog," a very Bradburian piece, in which a Stevens Tech graduate named Abe Shapiro invents a mathematical formula which allows him to reduce everything written and published in a given day to a six-letter word. His first attempt produces "Irtnog," his second attempt "Efsitz." There seem to be echoes of this story in the F451 passage where Beatty is telling Montag about the history of the firemen.